Hollow engine valve and production method thereof
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United States of America Patent
Stats
-
May 14, 2024
Grant Date -
Nov 9, 2023
app pub date -
Mar 16, 2021
filing date -
Mar 16, 2021
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A hollow engine valve includes a shaft portion and an umbrella portion of which diameter is enlarged to form an umbrella shape to be provided on a base end of the shaft portion, a cooling material being enclosed in a hollow portion that is at least formed inside the shaft portion. The shaft portion comprises a first shaft portion in a tip end side, a second shaft portion that is provided in a base end side to have an outer diameter larger than that of the first shaft portion, and a stepped portion formed by a difference in the outer diameters between the first and second shaft portions. A wall thickness of the stepped portion is larger than that of the second shaft portion.
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Family
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Cited Art Landscape
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